I used a weak solution of muriatic acid (about 1 cup acid to 1 gallon of water) ALWAYS add acid to water not the other way around. I covered the bottom of the tub and left to soak until the lime began to soften and then cleaned around the edges with a razor blade scraper just like cleaning paint off of glass. I needed to repeat the process several times to keep softening the lime but what we had thought was a tub with the porcelain worn down to the cast iron base was nothing more than 80 years of lime deposits.
Dale in the Flatlands. "Why waste time learning when ignorance is instantaneous."
Joyce O wrote:
Need help on a product that can clean the rust and lime build up on an old bathtub that has had a water drip for many many years. This is one of those cast iron bath tubs.
Joyce aka Mom aka Nana
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